scholarly journals Activated persulfate by iron-based materials used for refractory organics degradation: a review

2020 ◽  
Vol 81 (5) ◽  
pp. 853-875 ◽  
Author(s):  
Yanjiao Gao ◽  
Pascale Champagne ◽  
David Blair ◽  
Ouwen He ◽  
Tiehong Song
Keyword(s):  
Transition Metals ◽  
Advanced Oxidation Processes ◽  
Ferric Iron ◽  
Operating Conditions ◽  
Zero Valent Iron ◽  
Practical Application ◽  
Treatment Research ◽  
Iron Based ◽  
Materials Used ◽  
Refractory Organics

Abstract Recently, the advanced oxidation processes (AOPs) based on sulfate radicals (SRs) for organics degradation have become the focus of water treatment research as the oxidation ability of SRs are higher than that of hydroxyl radicals (HRs). Since the AOP-SRs can effectively mineralize organics into carbon dioxide and water under the optimized operating conditions, they are used in the degradation of refractory organics such as dyes, pesticides, pharmaceuticals, and industrial additives. SRs can be produced by activating persulfate (PS) with ultraviolet, heat, ultrasound, microwave, transition metals, and carbon. The activation of PS in iron-based transition metals is widely studied because iron is an environmentally friendly and inexpensive material. This article reviews the mechanism and application of several iron-based materials, including ferrous iron (Fe2+), ferric iron (Fe3+), zero-valent iron (Fe0), nano-sized zero-valent iron (nFe0), materials-supported nFe0, and iron-containing compounds for PS activation to degrade refractory organics. In addition, the current challenges and perspectives of the practical application of PS activated by iron-based systems in wastewater treatment are analyzed and prospected.

The sequestration of aqueous Cr(VI) by zero valent iron-based materials: From synthesis to practical application

2021 ◽  
pp. 127678
Author(s):  
Yi Fang ◽  
Xiange Wu ◽  
Min Dai ◽  
A. Lopez-Valdivieso ◽  
Saleem Raza ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Practical Application ◽  
Iron Based

scholarly journals Enhancement of Iron-Based Photo-Driven Processes by the Presence of Catechol Moieties

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 372
Author(s):  
Javier Moreno-Andrés ◽  
Iván Vallés ◽  
Paula García-Negueroles ◽  
Lucas Santos-Juanes ◽  
Antonio Arques
Keyword(s):  
Fenton Reaction ◽  
Advanced Oxidation Processes ◽  
Salt Water ◽  
Degradation Process ◽  
Contaminants Of Emerging Concern ◽  
Low Salt ◽  
Aquaculture Industry ◽  
Iron Based ◽  
Ph Range ◽  
Fenton System

Photo-induced Advanced Oxidation Processes (AOPs) using H2O2 or S2O82− as radical precursors were assessed for the abatement of six different contaminants of emerging concern (CECs). In order to increase the efficiency of these AOPs at a wider pH range, the catechol organic functional compound was studied as a potential assistant in photo-driven iron-based processes. Different salinity regimes were also studied (in terms of Cl− concentration), namely low salt water (1 g·L−1) or a salt–water (30 g·L−1) matrix. Results obtained revealed that the presence of catechol could efficiently assist the photo-Fenton system and partly promote the photo-induced S2O82− system, which was highly dependent on salinity. Regarding the behavior of individual CECs, the photo-Fenton reaction was able to enhance the degradation of all six CECs, meanwhile the S2O82−-based process showed a moderate enhancement for acetaminophen, amoxicillin or clofibric acid. Finally, a response-surface methodology was employed to determine the effect of pH and catechol concentration on the different photo-driven processes. Catechol was removed during the degradation process. According to the results obtained, the presence of catechol in organic macromolecules can bring some advantages in water treatment for either freshwater (wastewater) or seawater (maritime or aquaculture industry).

scholarly journals Analysis and Comparative Assessment of Basic Tribological Properties of Selected Polymer Composites

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 75 ◽  
Author(s):  
Jerzy Jozwik ◽  
Krzysztof Dziedzic ◽  
Marcin Barszcz ◽  
Mykhaylo Pashechko
Keyword(s):  
Polymer Composites ◽  
Friction Force ◽  
Tribological Properties ◽  
Friction Pair ◽  
Computer Software ◽  
Operating Conditions ◽  
The Coefficient Of Friction ◽  
Cast Polyamide ◽  
Friction Path ◽  
Materials Used

Phenomena occurring in the contact area between two mating bodies are characterised by high complexity and variability. Comparisons are usually made between parameters such as the coefficient of friction, friction force, wear and temperature in relation to time and friction path. Their correct measurement enables the proper evaluation of tribological properties of materials used in the friction pair. This paper concerns the measurements of basic tribological parameters in the friction of selected polymer composites. Knowing the tribological properties of these composite materials, it will be possible to create proper operating conditions for kinematic friction pairs. This study investigated the coefficients of friction, friction force and temperatures of six polymer composites: cast polyamide PA6 G with oil, PA6 G with MoS2, polyoxymethylene POM with aluminium, polyethylene terephthalate PET with polytetrafluoroethylene PTFE, PTFE with bronze, and PTFE with graphite. The friction surface was also examined using an optical system and computer software for 3D measurements. As a result, PA6-G with oil was found to be the best choice as a composite material for thin sliding coatings.

Nano zero-valent iron harms methanogenic archaea by interfering with energy conservation and methanogenesis

2021 ◽  
Author(s):  
Yuanxu Song ◽  
Liangfeng Duan ◽  
Kaifeng Du ◽  
Chao Song ◽  
Shan Zhao ◽  
...  
Keyword(s):  
Oxidative Damage ◽  
Energy Conservation ◽  
Methanogenic Archaea ◽  
Zero Valent Iron ◽  
Pollutant Remediation ◽  
Nano Zero Valent Iron ◽  
Iron Based

Iron-based nanoparticles (Fe-NPs), often applied for pollutant remediation, inevitably interact with various organisms either directly or indirectly. The well-acknowledged toxicological mechanisms for Fe-NPs on organisms are causing oxidative damage and...

scholarly journals Breathable Materials for Triboelectric Effect-Based Wearable Electronics

2018 ◽  
Vol 8 (12) ◽  
pp. 2485 ◽  
Author(s):  
Congju Li ◽  
Ran Cao ◽  
Xiuling Zhang
Keyword(s):  
Recent Progress ◽  
Dielectric Materials ◽  
Wearable Devices ◽  
Wearable Electronics ◽  
Practical Application ◽  
Metal Mesh ◽  
Frictional Materials ◽  
Nanofiber Membranes ◽  
Materials Used ◽  
Triboelectric Effect

Wearable electronics are believed to be the future of the next-generation electric devices. However, the comfort of current wearable devices is greatly limited due to the use of airtight materials, which may even lead to inflammation of the skin. Therefore, breathable, skin-friendly materials, are highly desired for wearable devices. Here, the recent progress of the breathable materials used to fabricate skin-friendly electronics is reviewed by taking triboelectric effect-based wearable electronics as a typical example. Fibers, yarns, textiles, and nanofiber membranes are the most popular dielectric materials that serve as frictional materials. Metal mesh, silver yarn, and conductive networks made up of nanomaterial are preferred as air-permissive electrodes. The breathable materials for skin-friendly wearable electronics summarized in this review provide valuable references for future fabrication of humanized wearable devices and hold great significance for the practical application of wearable devices.

scholarly journals Investigation of the Structural Deformation Behaviour of the Subsoiler and Paraplow Tines by Means of Finitie Element Method

2017 ◽  
Vol 5 (12) ◽  
pp. 1482
Author(s):  
Kemal Cagatay Selvi
Keyword(s):  
Agricultural Land ◽  
Deformation Behaviour ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
High Energy ◽  
Operating Conditions ◽  
Structural Deformation ◽  
Soil Tillage ◽  
Materials Used ◽  
Element Method

In this study, static stress-deformation analyzes (in terms of material strengths) were presented comparatively through a FEM-based simulation of the subsoiler and paraplow legs designed in a three-dimensional CAD environment. In general, both soil tillage implements with high energy requirements are being used to remove the soil compaction problem on agricultural land. The operating conditions of the implements were simulated using a FEM-based simulation program (Ansys-16). The results of static analysis obtained from the Finite Element Method (FEM) were evaluated on some different materials used in the shank design of both implements and the results were given comparatively. According to the analysis results, the maximum equivalent stress was in paraplow shank foot 122 MPa which is used C-60 material and the maximum vertical dis-placement is 0,00014 mm in the position of shank foot of subsoiler

scholarly journals THE MAIN TEST RESULTS OF THE MI-2MSB HELICOPTER EQUIPPED WITH THE EXPERIMENTAL SYSTEM OF SMALL ARMS AND SERIES-PRODUCED SYSTEM OF UNGUIDED MISSILE ARMAMENT

2020 ◽  
pp. 26-32
Author(s):  
A. Berezniak ◽  
Т. Dudnik ◽  
O. Zakutko
Keyword(s):  
Experimental System ◽  
Operating Conditions ◽  
Test Results ◽  
Practical Application ◽  
Flight Crew ◽  
Small Arms ◽  
Functional Capabilities ◽  
Actual Volume ◽  
Type C ◽  
Missile System

The summarized results of special tests of the Mi-2MSB helicopter equipped with the experimental system of 12,7 mm small arms (as a part with series-produced machine guns NSVT-12,7) and the serial system of unguided missile armament (NAR type C-8) are presented. The actual volume of assessments of inspections and work performed during the tests is given. According to the results of processing the test materials, it was determined that the tactical range of the Mi-2MSB helicopter with the installed weapons system and boxes for collecting spent units (in the design provided for testing) at a takeoff mass of 3700 kg, at an altitude of not more than 300 m during combat mission in the area of the target for 5 minutes and the remaining fuel on the landing of 100 liters is (not less): version of combat equipment 2 × B8V8MSB (payload - 16 NAR) - 190 km; version of combat equipment 2 × NSVT-12.7 (payload - 600 rounds) - 200 km; version of combat equipment 2 × B8V8MSB + 2 × NSVT-12.7 (payload - 16 NAR and 600 rounds) - 155 The results of special tests practically showed that the Mi-2MSB helicopter, equipped with an aviation weapon system, in addition to the functional tasks defined for the basic Mi-2MSB helicopter, is able to provide: training and maintenance of skills for flight crew in the practical application of unguided aviation weapons and gun armaments in all types of maneuvering, defined by the tactics of army aviation; accomplishment of certain tasks on air support of columns of troops on the march and fire missions on destruction of enemy manpower, single unarmored and lightly armored targets such as car, armored personnel carrier, infantry fighting vehicle, boat, The main combat and functional capabilities in the actual operating conditions confirmed by the results of special tests as well as their validation of specified requirements make it possible (after eliminating the shortcomings identified in the test), to allow operation of Mi-2MSB helicopter in the entire operating range of heights and speeds equipped with aircraft weapons as part of the unguided missile system (NAR type C-8) and small arms system (as part of the series-produced machine guns NSVT-12.7)).

High-loaded sub-6 nm Pt1Co1 intermetallic compounds with high-efficient performance expression in PEMFCs

2021 ◽  
Author(s):  
Qingqing Cheng ◽  
Shuai Yang ◽  
Cehuang Fu ◽  
Liang-Liang Zou ◽  
Zhi-Qing Zou ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Intermetallic Compounds ◽  
High Performance ◽  
Reduction Reaction ◽  
Operating Conditions ◽  
Practical Application ◽  
Efficient Performance ◽  
High Efficient ◽  
High Metal

High-loaded oxygen reduction reaction (ORR) Pt intermetallic compounds with high performance expression under PEMFC operating conditions are prerequisite for practical application. Nevertheless, high metal-loading would lead to the severe agglomeration...

Kinetic study of dye removal using TiO2 supported on polyethylene terephthalate by advanced oxidation processes through neural networks

2019 ◽  
Vol 79 (6) ◽  
pp. 1134-1143 ◽  
Author(s):  
Ada Azevedo Barbosa ◽  
Ramon Vinicius Santos de Aquino ◽  
Naiana Santos da Cruz Santana Neves ◽  
Renato Falcão Dantas ◽  
Marta Maria Menezes Bezerra Duarte ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Polyethylene Terephthalate ◽  
Advanced Oxidation Processes ◽  
Dye Removal ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Order Model ◽  
Oxidation Processes ◽  
First Order ◽  
Pseudo First Order

Abstract This work investigated the efficiency of polyethylene terephthalate (PET) as support material for TiO2 films in the photocatalytic degradation of red Bordeaux and yellow tartrazine dyes. The optimum operating conditions were determined by a factorial design, which resulted after 180 min of treatment in degradations of 99.5% and 99.1% for the UVC/H2O2/TiO2Sup and solar/H2O2/TiO2Sup systems, respectively. For the kinetic study, the experimental data fitted to the pseudo-first-order model and the calculated kinetic constants (k) values were 0.03 min−1 for the UVC/H2O2/TiO2Sup system and 0.0213 min−1 for the system solar/H2O2/TiO2Sup. It was verified that TiO2 supported in the PET remained with high degradation efficiency even after five cycles of reuse, indicating a good stability of the photocatalyst in the support. A significant reduction of TOC content was also observed along the reaction time. The phytotoxicity bioassay with Lactuca sativa demonstrated that after treatment with UVC/H2O2/TiO2Sup and solar/H2O2/TiO2SUP, an increase in IC50 and consequently lower toxicity was observed.

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